/*
 Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA

*/

package com.mysql.jdbc.jdbc2.optional;

import javax.transaction.xa.Xid;

/**
 * Implementation of the XID interface for MySQL XA
 * 
 * @version $Id: $
 */
public class MysqlXid implements Xid {

	int hash = 0;

	byte[] myBqual;

	int myFormatId;

	byte[] myGtrid;

	public MysqlXid(byte[] gtrid, byte[] bqual, int formatId) {
		this.myGtrid = gtrid;
		this.myBqual = bqual;
		this.myFormatId = formatId;
	}

	public boolean equals(Object another) {

		if (another instanceof Xid) {
			Xid anotherAsXid = (Xid) another;

			if (this.myFormatId != anotherAsXid.getFormatId()) {
				return false;
			}

			byte[] otherBqual = anotherAsXid.getBranchQualifier();
			byte[] otherGtrid = anotherAsXid.getGlobalTransactionId();

			if (otherGtrid != null && otherGtrid.length == this.myGtrid.length) {
				int length = otherGtrid.length;

				for (int i = 0; i < length; i++) {
					if (otherGtrid[i] != this.myGtrid[i]) {
						return false;
					}
				}

				if (otherBqual != null && otherBqual.length == myBqual.length) {
					length = otherBqual.length;

					for (int i = 0; i < length; i++) {
						if (otherBqual[i] != this.myBqual[i]) {
							return false;
						}
					}
				} else {
					return false;
				}

				return true;
			} else {
				return false;
			}
		} else {
			return false;
		}
	}

	public byte[] getBranchQualifier() {
		return this.myBqual;
	}

	public int getFormatId() {
		return this.myFormatId;
	};

	public byte[] getGlobalTransactionId() {
		return this.myGtrid;
	}

	public synchronized int hashCode() {
		if (this.hash == 0) {
			for (int i = 0; i < this.myGtrid.length; i++) {
				this.hash = 33 * this.hash + this.myGtrid[i];
			}
		}

		return this.hash;
	}
}
